CBSE Physics Sample Question Paper : Set II
Q. 1. Define atomic mass unit (a.m.u.). Write the energy equivalent of atomic mass unit in MeV.
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Q. 2. Why does the electric field inside a dielectric decreases when it is placed in an external field ?
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Q. 3. State any rule which relates the direction of electric current and the direction of the accompanying magnetic field. 1
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Q. 4. What is the phase difference between the voltage drop across L and C in a series LCR circuit connected to an AC source ? 1
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Q. 5- Arrange the following radiations in descending order of their wavelengths.
Radiowaves, X-rays, ultraviolet rays and red light. 1
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Q. 6. A transistor is being used as a common emitter amplifier. What is the value of phase difference, if any, between the collector-emitter voltage and input signal V 1
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Q. 7. Two wires A and B of the same material and having the same length, have their cross-sectional areas in the ratio 1 : 4. What would be the ratio of heat produced in these wires when same voltage is applied across each ? 1
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Q. 8. Why does the conductivity of a semiconductor increase with-rise in temperature ?
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Q. 9. Define the term critical angle for a given pair of media. Establish its relationship with their refractive index.
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Q. 10. Observations of a given device yielded the following current-voltage data : 2
Current (amperes) : Voltage (volts)
1-0 : 19-7
20 : 39-4
4-0 : 78-8
50 : 98-5
Draw V-I graph using the above data. What conclusion can you draw from the graph with
regard to ohmic and non-ohmic nature of the device ? 2
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Q. 11. Suppose you have two bars of identical dimensions, one made of paramagnetic substance and the other of diamagnetic substance. If you place these bars along a uniform magnetic field, show diagrammatically, what modifications in the field pattern would take place in each case. 2
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Q. 12. What are thermal neutrons ? Why are neutrons considered as ideal particles lor nuclear fission ?
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Q. 13. Calculate the equivalent capacitance between points A and B in the following combination.
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Q. 14. A wire of resistance 4R is bent in form of a circle. What is the effective resistance between the ends of the diameter ?
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Q. 15. A magnetised needle in a uniform magnetic field experiences a torque but no force.’ However, an iron nail near a bar magnet experience a force of attraction in. addition to a torque. Explain.
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